Implement serial API for Windows.

chrome/browser/extensions/api/serial/serial_apitest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/serial/serial_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_function_test_utils.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 15 matching lines @@
   catcher.RestrictToProfile(browser()->profile());
 
   ExtensionTestMessageListener listener("serial_port", true);
 
   ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII("serial/api")));
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 
 #if 0
   // Enable this path only if all the following are true:
   //
-  // 1. You're running Linux.
+  // 1. You have an Adafruit Atmega32u4 Breakout Board attached to your machine
+  // and properly appearing as the first virtual serial port ("first" is very
+  // loosely defined as whichever port shows up in serial.getPorts). Other
+  // devices will work, but this is the only one tested.
   //
-  // 2. You have an Adafruit ATmega32u4 breakout board attached to your machine
-  // via USB with the Arduino Leonardo bootloader flashed to the board. Other
-  // devices will work; this is the only one tested.
+  // 2. Your user has permission to read/write the port. For example, this might
+  // mean that your user is in the "tty" group on Ubuntu flavors of Linux, or
+  // else that /dev/ttyACM0 has global read/write permissions.
   //
-  // 3. Your user has permission to read/write the /dev/ttyACM0 device.
-  //
-  // 4. You have uploaded a program to the '32u4 that does a byte-for-byte echo
+  // 4. You have uploaded a program to the board that does a byte-for-byte echo
   // on the virtual serial port at 57600 bps. Here is an example (built using
   // the Arduino IDE):
   //
   // void setup() {
   //   Serial.begin(57600);
   // }
   //
   // void loop() {
   //   while (true) {
   //     while (Serial.available() > 0) {
   //       Serial.print((char)Serial.read());
   //     }
   //   }
   // }
-  //
-  // TODO(miket): Enable a more forgiving set of test conditions, specifically
-  // by mocking SerialConnection.
-  listener.Reply("/dev/ttyACM0");
+  listener.Reply("echo_device_attached");
 #else
-  listener.Reply("none");
+  listener.Reply("false");
 #endif
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
 }